Merge branch '9491-graphql-view-design-board-at-version-ce' into 'master'

CE backport for "Show design boards at previous versions in GraphQL"

See merge request gitlab-org/gitlab-ce!30151

1 files changed, 32 insertions, 0 deletions

diff --git a/lib/gitlab/graphql/find_argument_in_parent.rb b/lib/gitlab/graphql/find_argument_in_parent.rb
new file mode 100644
index 00000000000..1f83f8fce7a
--- /dev/null
+++ b/lib/gitlab/graphql/find_argument_in_parent.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Graphql
+    module FindArgumentInParent
+      # Searches up the GraphQL AST and returns the first matching argument
+      # passed to a node
+      def self.find(parent, argument, limit_depth: nil)
+        argument = argument.to_s.camelize(:lower).to_sym
+        depth = 0
+
+        while parent.respond_to?(:parent)
+          args = node_args(parent)
+          return args[argument] if args.key?(argument)
+
+          depth += 1
+          return if limit_depth && depth >= limit_depth
+
+          parent = parent.parent
+        end
+      end
+
+      class << self
+        private
+
+        def node_args(node)
+          node.irep_node.arguments
+        end
+      end
+    end
+  end
+end